package thinkingInJava.io;
// page 525 演示 File 取文件/目录名 list
//: io/DirList.java
//Display a directory listing using regular expressions.
//{Args: "D.*\.java"}
import java.util.regex.*;
import java.io.*;
import java.util.*;

public class DirList {
public static void main(String[] args) {
 File path = new File(".");
 String[] list;
 if(args.length == 0)
   list = path.list();
 else
   list = path.list(new DirFilter(args[0]));
 Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
 for(String dirItem : list)
   System.out.println(dirItem);
}
}

class DirFilter implements FilenameFilter {
private Pattern pattern;
public DirFilter(String regex) {
 pattern = Pattern.compile(regex);
}
public boolean accept(File dir, String name) {
 return pattern.matcher(name).matches();
}
} /* Output:
DirectoryDemo.java
DirList.java
DirList2.java
DirList3.java
*///:~
